"Human" by Christina Perri is originally performed in the key of F# minor. Released in 2013 as the lead single from her second studio album, "Head or Heart," the song was both written and performed by Christina Perri herself. "Human" explores themes of vulnerability, resilience, and the complexities of being human. Perri wrote the song as a reflection on her own struggles with self-doubt and the need for self-acceptance. The melody is characterized by its emotive vocals and piano-driven arrangement, creating a poignant and introspective atmosphere. "Human" resonated with audiences worldwide, becoming one of Perri's most popular and critically acclaimed songs.